Production of warp fabric



Dec. 23, 1941. P, SCHC SNFELD PRODUCTION OF WARP FABRIC Filed Oct. 9,1940 Jgremar: P401. sc x/oxvrzo or/zeys Patented Dec. 23, 1941Application 0mm 9,1940, Serial No. 360,371

In ,Germany July 10, 1939 v 2 Claims. This invention relates to a methodof producing a transversely ribbed warp fabric, wholly or I partlyprovided with underlaid rubber warp threads, on a warp loom having onlyone row of needles, in which the lapping machine for the rubberthrea-dstis always racked in the-same direction as the lapping machinefor the ground thread.

It is known to produce transversely ribbed warp goods wholly or partlyprovided with underlaid rubber warp threads on warp looms having onlyone row of needles, in which the rubber threads serve the doublefunction of imparting rubberlike elasticity to the textile'base and offorming the transverse ribs. According to an older proposal relatinghereto the rubber thread machine is alternately racked in. the samedirection as the ground thread machine and then again in a directionopposite thereto, whereas in accordance with a more recent proposal therubber thread machine is racked always in the same direction as theground thread machine. The purpose of the second proposal is to avoidthe alternate opthreads, when placed around the needles at certainpointsonly, will notform proper meshes.

This difiiculty is eliminated according to the invention by placing therubber threads around the needles in spots where each of them forms asingle mesh in such manner that they are introduced at these points intheir racking direction into the courses concerned at least one needleahead of the needles which work them into meshes and that they arelapped from .this point of introduction up to the needles producing therubber mesh in the form of an underlaying operation.

In this way, the ru ber threads prior to their mesh-forming displacementare held by the needles positioned in the racking direction of therubber thread machine in front of the needles eration of the rubberthread machineand thereby to obviate the well-known drawbacks connectedwith this racking method. To insure interweaving of the rubber threadsin the ground fabric lapped by the lower machine in the second method,the rubber thread machine carries out underlaying, operations at thepoints con cerned, which are greater or smaller than those of the groundthread machine. formed by omitting lateral racking of the rubber threadsbetween the points mentioned or by causing the rubber threads to carryout underlaying operations of a size equal to that of the underlayingoperations performed by the ground threads, sothat the rubber threadsare freely exposed at these points on one or the other side of. thegoods and can unrestrainedly contract and thereby simultaneously effectcontraction of the fabric at these points, which automatically leads tothe formation of ribs.

The known method outlined above is, howiabric produced in conformitytherewith therubber warp threads are not secured against running back,and it is the objector the invention to overcomethis drawback.

This object could be attained merely by placing' the rubber warp threadsaround the needles in spots, so that each of the threads would formthere a single mesh, butthis procedure is notnpracticable tor the reasonthat the rubber The ribs are' ever, open to the serious objection thatin a which work the threads into meshes, andas all necessaryrequirements for the loopin of the rubber threads are complied with.from the start, further correct working of the rubber threads to formproper meshes is insured.

The invention is illustrated by way of example in the accompanyingdrawing showing a lapping diagram.

The groundfabric threads I are gathered in known manner in the lowerlappingmachine carrying outunderlaying operations under two needles..According to the drawing, this machine laps a plain cord, and thethreads are worked under 2 over I and back. The rubber warp threads 2are gathered in the upper ma chine which, however, does not merely carryout underlaying operations but arranges, in,

places, the rubber threads 2 around the needles, which at these pointseach form a single mesh. The mesh-forming lapping of the rubber threads2 occurs in the courses 3. For the purpose of forming ribs the rubberthreads are not subjected to lateral racking in spots, for instance inthe courses 4. In the courses 3 where the rubber threads surround theneedles for looping, they are laterally racked in the same direction asthethreads I, and the rubber, thread group .laps therefore always withthe ground thread group. I

vA further feature of the invention is that the rubber threads 2 duringmesh-forrm'ng lapping in the courses 3 are always introduced in, theirracking direction at least one'needle ahead of the needles which workthem into meshes and that they are lapped from this point ofintroduction in the courses 3 in the form of underinthesround Theinvention maybe applied of course also to the'mcthcd according towhichriha are formed underlaylng operations of exactly the same extentasthesroundthreadbut'alsobwomitflnzalternaterackingottherubberthreadnandflmhaving 'them carry out anunderlain openflon equalinsizetothatoi'thegroundthreads.

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